DALLAS, Tx. (CNN) -- Dallas police officer Amber Guyger says she shot and killed Botham Shem Jean after she thought she was entering her own apartment, not realizing she was on the wrong floor. Guyger stands charged with manslaughter.

CNN affiliate KTVT obtained a copy of an arrest warrant affidavit from the Dallas County District Attorney's Office. Here's what it says:

Jean lived in apartment #1478, Guyger lives in #1378

Both apartments are identical or extremely similar in terms of floorplan, exterior surroundings, structure and description

Jean was home alone when Guyger, still in uniform after her shift, entered the apartment

Guyger parked her vehicle on the fourth floor, entered the building and walked toward what she thought was her apartment

She used her door key, which has an electronic chip, to try to enter the apartment

The door was slightly ajar when she approached it

The door opened under the force of the key insertion

The interior of the apartment was nearly completely dark

Guyger could make out a large silhouette across the room

She drew her weapon, believing there was an intruder in her apartment

Her verbal commands to Jean were ignored

Guyger fired two shots at Jean, striking him once in the torso

Guyger then entered the apartment, called 911 and started administering first aid to Jean

She turned on the lights while on the phone with 911, and when they asked for her address, she realized she was in the wrong apartment

She requested an ambulance and police to come to the apartment

Jean was transported to Baylor Hospital, where he died

Guyger remained at the scene and told officers and the 911 operator that she thought she was in her apartment when she shot Jean